TRANSYT 13.1.2:  Maintenance holders can download this latest release from here.

For changes see Release Notes.  

Introduction

TRANSYT is an international product, used by hundreds of consultancies and local authorities around the world.  It is an off-line computer program for determining and studying optimum fixed-time co-ordinated traffic signal timings in any network of roads for which the average traffic flows are known.  Its use around the world reflects the product's international appropriateness and flexibility as a design and network optimisation tool.

TRANSYT 13 is built upon extensive quality research over many years and is a powerful, useful and time-saving tool in the Traffic Engineer’s arsenal.

How it works

Within its core, a traffic model of the network calculates a Performance Index (PI) in monetary terms (based on delays and stops), whilst an optimising routine searches for the timings which reduce the PI to a minimum value - subject to minimum green and other constraints.

TRANSYT Features

TRANSYT 13 also models time-varying traffic conditions, producing signal timings which are optimised for the complete time period and capacity, queue and delay results for each condition and for the overall situation.

The model also provides for give-way priority control, including the modelling of opposed right-turn traffic within signalled junctions. The program can be used to produce timings which give priority to buses, trams or emergency vehicles, without the need to detect individual special vehicles within mixed traffic streams.

Fully-signalised or partially-signalised roundabouts can be modelled and their delay minimised by calculating timings which reduce blocking-back by keeping the circulating carriageway free flowing.  Where blocking does occur TRANSYT’s cell-transmission model can be used to model its effects.

Weighting factors and queue length penalties can be applied to individual links in order to encourage the optimiser to produce timings that avoid queues beyond a certain length or to reduce delays on specific links. 

TRANSYT includes the accurate modelling of flared (short lane) approaches. This is particularly important in modelling signalised roundabout approaches where flares are common.

Individual signalised junctions (with and without internal stop-lines) can be easily modelled in TRANSYT

Both isolated and 'within junction' signalled pedestrian crossings can be represented within the TRANSYT network model and the provision of green times for pedestrians reported.

It is suitable for both drive-on-the-left and drive-on-the-right operation.

Documentation

A comprehensive User Guide is provided that will guide you through all aspects of the program.  Also provided with the package is free basic technical support and guidance for the first twelve months.

New Features in TRANSYT 13

The latest version of TRANSYT (TRANSYT 13.1) represents the biggest step-change in its history, in terms of functionality and investment by TRL.  The following bullet points highlight the advantages of TRANSYT 13.1 over previous versions:

• CTM (cell transmission model) allowing the modelling of blocking back effects and graphical animation of traffic cells throughout the network
• Improved opposed right-turn model
• Flow O-D data specification and automatic allocation to link flows
• Time-Distance diagrams
• Works directly with link/phase timings and intergreen matrices
• Time-varying traffic flow conditions catered for
• Explicitly defined pedestrian and tram links
• Point-to-point journey time calculation 
• New dynamic graphical user interface
• New network drawing tool – fully integrated, fully interactive and improved
• Graphical cycle-time optimisation
• Generic X-Y Graph Generator
• Updated ‘standard’ graphs and a new selection of CTM graphs
• Graphical colour HTML reporting
• Custom tabulation of results 
• Signalised links associated with both a signals node and a traffic node, allowing special cases to be modelled more easily
• Nodes can be double, triple, and quadruple-cycled, and each link can have up to four green periods
• New outputs, including un-weighted P.I, wasted green time and end-of-red/green queues
• Various data ranges extended e.g. size of network, number of upstream links and shared links, increased
• Multiple demand sets within one file
• Flexible data grids making data input and results analysis easier
• Easy import and export of data using ‘cut and paste’
• Automatic 'Product Update Information' System  

TRANSYT 13 allows files produced from TRANSYT 12, TRANSYT 11 and TRANSYT/10 to be imported and re-analysed, including TRANSYT 12 NetCon diagram files.  TRANED 2 files can also be imported.

A component for TRANSYT 13 (TRANSYT-VISSIM LINK) can be bought that allows TRANSYT to optimise signal timings for VISSIM Networks.

A component for TRANSYT 13 (TRANSYT-Aimsun LINK) can be bought that allows TRANSYT to optimise signal timings for Aimsun Networks.

To download more comprehensive details of TRANSYT 13 (including sample screenshots) please click here.